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Annals of Occupational Hygiene Advance Access published online on August 6, 2004
Annals of Occupational Hygiene, doi:10.1093/annhyg/meh050
Copyright © 2004 by the British Occupational Hygiene Society.
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Received July 18, 2002
Accepted December 30, 2003

Article

The Efficacy of Local Exhaust Ventilation for Controlling Dust Exposures During Concrete Surface Grinding

Gerry A. Croteau 1*, Mary Ellen Flanagan 1, Janice E. Camp 1, Noah S. Seixas 1

1 Department of Environmental and Occupational Health Sciences, University of Washington, 4225 Roosevelt Way NE, Suite 100, Seattle, WA 98105-6099, USA

* To whom correspondence should be addressed. E-mail: croteau{at}u.washington.edu.


  Abstract

This study assessed the effectiveness of a commercially available local exhaust ventilation (LEV) system for controlling respirable dust and crystalline silica exposures during concrete grinding activities. Surface grinding was conducted at six commercial building construction sites in Seattle, WA, by cement masons. Time-integrated filter samples and direct reading respirable dust concentrations were collected using a cyclone in line with a direct reading respirable dust monitor. Personal exposure levels were determined with and without LEV, one sample directly after the other. A total of 28 paired samples were collected in which three different dust collection shroud configurations were tested. Data obtained with a direct reading respirable dust monitor was adjusted to remove non-work task-associated dust exposures and was subsequently used to calculate the exposure reduction achieved. The application of LEV resulted in a reduction in the overall geometric mean respirable dust exposure from 4.5 to 0.14 mg/m3, a mean exposure reduction of 92%. Despite the effective control of dust generated during surface grinding, 22 and 26% of the samples collected while LEV was being used were greater than the 8 h time-weighted average permissible exposure limit (Occupational Safety and Health Administration) and threshold limit value (American Congress of Governmental Industrial Hygienists) for respirable crystalline silica, respectively.


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